Sofa



FIG. 1 is a perspective view of a sofa in accordance with the present invention;

FIG. 2 is a front view of the sofa of FIG. 1;

FIG. 3 is a left-side view of the sofa, the right-side view being a mirror image, thereof;

FIG. 4 is a back view of the sofa; and,

FIG. 5 is a top view of the sofa. 

The ornamental design for a sofa, as shown and described. 